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Session Two Working with data

Importing data in Oasis Montaj

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Session TwoWorking with data

In this SessionOpening new or existing Project

Importing data into Oasis Montaj

Basic operations on database channels

Gridding of simple data.

Basic operations on grids.

Opening new or existing ProjectDef.Project file include links to all databases, grids and maps. Oasis Montaj adopt this kind files so that all previous analysis are recorded for further analysis or interpretation. Remember, at the end of session you need to make sure that you saved all your work to the project file opened.

We have two options under project menu item, New and Open. If you are starting from scratch you choose New otherwise, choose open. Clicking any of the two will result in opening a file manager window (next slide).

File manager window to create or open project

Demonstrating this step on real OM session

It is recommended to open new directory of your new project. Transfer your data files to that directory save your work (e.g. database, grids, maps etc.) their. It is also recommended to make backup for that directory each time you carry out analysis and modeling within your project to avoid loss of your work.

Importing Data

Your data

Import

OM database

Q. What does database mean?a usually large collection of data organized especially for rapid search and retrieval (as by a computer)

Q. What are the kinds of data I can import into Oasis Montaj?Any data that can be tabulated in the form of columns can be imported to OM. The file format can be ascii, Spreadsheet (excel), databases etc. In addition some industry standard formats like AMIRA and SEGY can also be imported.

Import data from this menu item

Data formats that can be imported

ASCIIEXCEL SPREADSHEETWe will concentrate on

Importing ASCII files ASCII files is a plain text file that can be generated, edited using any text editor such as notepad.

Data should be tabulated into columns with separation like space, tab or comma.

Importing ASCII fileBrowse for the ASCII file you want to import.

Wizard optionThis option defines how the data in the ascii files are arranged. For example, the headers, the text separation and the data type (e.g. numbers, date etc)After defining the data in the file you may save this definitions into template files, if you have other files with similar formats. For subsequent file readings you use the template option instead of wizard.

Put database name here.

Database window

Demonstrating this step on real OM session

Operations in databasewindow

Two typesof operations

Channel def. and view options

Operations on the dataInside the channel

Operations on the data

statisticsShow profileShoesymbols

Gridding

Coord. definition

Choose channel data and gridding scheme

Demonstrating this step on real OM session

Working with Array channelsArray channel are usually used when importing Resistivity, Seismic, GPR etc.X and Y here represent the location of observationOr modeling points at the earths surface. The Z channelCannot be a single value. Thats why we adopt array channelsIn place of ordinary single values ones.

Sample database with array channel

Array channel

How to import array channel using ASCII import option?

Well, this can be done in the definition of data format using the wizard as in the following example.

Original Data

xy

Resistivity

Starting from this column

chooseThen enter the number of columns of your array channel here

Demonstrating this step on real OM session

Importing data from xls files

Choose whether your dataAre represented in Single or multi-sheets

Create new database

Browse for xls file to importChoose this then press OK

Demonstrating this step on real OM session

End of data Import Session